PMID: 6971268Dec 15, 1980Paper

Transplantation resistance of drug-treated hybrid or allogeneic mice against murine lymphomas. I. Immunopharmacology studies

International Journal of Cancer. Journal International Du Cancer
A BonmassarE Bonmassar

Abstract

Sequential treatment of mice with non-lethal doses of 5(3,3'-dimethyl-l-triazeno)-imidazole-4-carboxamide (DTIC) and cyclophosphamide (Cy) was found to produce long-term inhibition of endogenous cell proliferation in the spleen and profound impairment of classical allograft responses, similar to that detectable in lethally irradiated mice. Studies were carried out with drug-treated (i.e. treated with DTIC + Cy) conventional or nude mice inoculated with lymphoma cells homozygous for the H-2b or H-2d haplotype. Transplantation resistance in various tumour-host combinations was studied in terms of survival times after tumor challenge or lymphoma cell proliferation in spleen and liver, measured by the uptake of DNA precursor 125I-labelled 5-iodo-2'-deoxyuridine ([125I]dUrd). The results of in vivo transplantation immunity tests or in vitro tests of generation of cytotoxic lymphocytes confirmed that classical T-dependent allograft responses were abrogated by drug treatment of H-2-incompatible hosts. However, localized resistance against lymphoma graft, mainly at spleen level, was found in drug-treated hybrid mice, or conventional and "nude" allogeneic recipients, as judged by [123I]dUrd uptake inhibition. Resistance presumably regul...Continue Reading

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